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A page from Abbé Prévost’s ‘Histoire Générale des Voyages’. The top map shows the Bay of Laphao on Timor, while the other drawings are side views (or ‘elevations’) of mountains on the region’s islands to use as landmarks when navigating.

This colourful hand-drawn portolan (nautical) chart was designed to aid navigation. It features a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, anchor points and written notes.